Dust collector



Aug. 24, A1.943. T. B. ALLARDICE DUST COLLECTOR Filed Dec.v 17, 1940 u Patented Aug. 24, 1943 UNITED STATES- PATENT OFFICE f f 2,327,691 y DUST COLLECTOR. Thomas B. Allardice, Mountain Lakes, N. J.

Application December 17, 1940, Serial No. 370,444

2 claims. (c1. 183A This invention relates to apparatus for separating and collecting solid particles from heated gases and for recovering heat from the gases.

In an embodiment vof this invention designed for use with steam power plants, the heated flue gases ilow tangentially into involute tubes, in the upper portions of which are inserted the lower ends of round tubes. The solid particles are thrown out by the centrifugal forces developed by the curved gas ilow and drop out to a lower collector. The clean gases flow upwardly throughthe round tubes which above the cinder Y separating area, are given extended surface in a uid heating area. The air or other fluid to be heated is passed in contact with the extended surface. v

An object of the invention is to providea dust collector particularly suitable for use with a iiuid heater.

'I'he invention will now be described with reference to the drawing, of which:

Fig. 1 is a side elevation, in cross-section, of a combined dust collector and iluid heater embodying this invention;

Fig. 2 is a partial sectional View along the lines 2-2 of Fig. 1; v

Fig. 3 is a partial sectional View along the lines 3--3 of Fig. 1, and

Fig. 4 is an enlarged view witha portion in section, of one of the involute dust separating tube assemblies.

The casing 6 which houses the assembly has the air inlet 1, the air outlet 8, the gas inlet 94 ,and the gas outlet I8. The upper wall II and Y the lower wall I2 separate the gas handling and the air handling areas.

The separating chamber indicated generally by I3 extends in alignment with the gas inlet 9 and between the lower wall I2 and the hopper It. The separating chamber contains the six rows of involute tubes I5 having the tangential inlets I6 at the gas entering face of the chamber I3 as illustrated by Fig. 3. The tubesof each succeeding row with respect to gas ilow are stepped up in height so that the inlets I6 of each succeeding row extend above the upper ends of the preceding tubes. The tubes of the succeeding rows are preferably staggered asillustrated by Fig. 3.

The parallel, round tubes I1 extend vertically in the chamber I3 and their lower ends extend through the upper ends of the involute tubes I5 and serve as will be explained later for conveying the clean gas to the fluid heating chamber.

Just above the floor I2, the tubes I1, each branch into two tubes I8 for providing extended heat exchange surface. The upper ends of the tubes I8 terminate in the upper wall I I, the tubes discharging into the outlet I0 above the wall.

The cones I9 are held in the involute tubes I5 below the lower ends of the tubes I1, by the friction of their supporting arms 20 against the inner surfaces of the tubes I5. The arms 28 may be two or more in number and are suiciently spaced to permit the free passage of cinders and dust between them as illustrated by Fig. 4. The cones I9 serve to deflect the gases entering at I6 upwardly so as to pass out the tubes I1 and I8 instead of into the hopper I4. The distances of the cones I9 from the lower ends of the tubes I1 may be adjusted by moving the cones within the tubes I5.

In operation, air or other fluid to be heated is drawn in the inlet 1, passes in contact with the outer surfaces of the tubes I8 and then passes out theloutlet 8; A suitable conventional blower or other pump (not shown) may be used for moving the air-or other fluid through the inlet 1 vand the outlet 8.

The ue gases through the action of the fan system of the plant associated withlthe appa- 4ratus, or through the action of an auxiliary fan,

by the gas is thrown out by centrifugal force against the inner surfaces of the tubes I5 and falls-by gravity into the hopper I 4. The clean gas is deflected by the cones I9 into the lower ends of the tubes I1 and then passes through the tubes I8 to.heat the air or other uid in contact lwith their outer surfaces.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatus illustrated as modifications thereof may be suggested by those skilled in the art without departure from the essence of the invention.

-What is claimed is:

1. A dust collector having a casing with a gas inlet and a gas outlet, comprising a plurality of rows of parallel, 'substantially vertically extending, involute tubes having tangential inlets in their upper ends extending into said inlet, the

tubes of succeeding rows-'with respect to gas flow extending sufficiently above the upper ends of the tubes f precedngrows that the inlets of the tubes ofthe succeeding rows are completely above` the upper ends of the tubes of the preceding rows, a plurality of rows of gas outlet tubes having their lower ends extending into the upper ends of said involute tubes and having their upper ends connecting with said gas outlet, and

dust collecting means below and connecting with the lower ends of said involute tubes.

2. A dust collector having a casing with a gas inlet and/a gas outlet, comprising a plurality of rows of parallel, substantially vertically extending, involute tubes having tangential inlets in their upper ends, extending into said inlet, the tubes of succeeding rows with respect to gas flow extending sufficiently above the upper endsof the ends of said involute tubes and having their upper 'ends connecting with said gas outlet, and dust collecting means below and connecting with the lower ends of saidinvolute tubes, the involute tubes of succeeding rows with respect to gas iiow being staggered with respect to the involute tubes l of preceding rows whereby vthe tangential inlets of the involute tubes of thesucceeding rows are not obstructed by the preceding outlet tubes.

THOMAS B. ALLARDICE. 

